Prism.languages.docker = {
    'keyword': {
        pattern: /(^\s*)(?:ADD|ARG|CMD|COPY|ENTRYPOINT|ENV|EXPOSE|FROM|HEALTHCHECK|LABEL|MAINTAINER|ONBUILD|RUN|SHELL|STOPSIGNAL|USER|VOLUME|WORKDIR)(?=\s)/mi,
        lookbehind: true
    },
    'string': /("|')(?:(?!\1)[^\\\r\n]|\\(?:\r\n|[\s\S]))*\1/,
    'comment': /#.*/,
    'punctuation': /---|\.\.\.|[:[\]{}\-,|>?]/
};

Prism.languages.dockerfile = Prism.languages.docker;